Soil stabilization is one of the available methods to reduce compression of the fibrous peat soil and to increase its bearing capacity. Stabilizing agent admixture that has been developed for fibrous peat is a mixture of 30 CaCO3 lime and 70 rice husk ash RHA. It has been found that the percentage of the admixture which is able to provide the optimum improvement of the fibrous peat properties is 10 of the peat wet weight. The study however did not include the influence of water surrounding the stabilized peat area so that it is not the same with the field real condition. Based on this reason the study carried out herein was designed to place the stabilized peat samples in the middle of the saturated peat soil and it was kept in flooding condition. The percentages of admixture chosen for stabilization were varied 5 10 15 and 20 of the peat wet weight 37.5 75 112.5 and 150 of its dry weight. Each stabilized sample was cured at different time periods 10 20 and 30 days and all of them were placed in the middle of the saturated peat soil and they were kept in flooding condition. Afterwards the stabilized peat soils located at the closest and the fartherst from the surrounding saturated peat soil were determined their physical and engineering properties in order to know the influence of water from the outside of the stabilized fibrous peat soil to its behavior. The results show that the maximum improvement of the stabilized peat behavior are achieved when the admixture used is 15 of its wet weight 112.5 its dry weight and cured at least in 30 days. The total strain of the stabilized peat reduces about 55.86 and the bearing capacity increases about 2844. In addition the suction from the surrounding water causes the development process of silica gel in the soil pores can take place perfectly. Besides the decomposition process of the stabilized peat becomes slower due to it keeps inundated under water.

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